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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Cash flows from operating activities:    
Net income $ 22,417 $ 24,737
Adjustments to reconcile net income to net cash flows provided by operating activities —    
Depreciation and amortization of property and equipment 24,551 21,203
Amortization of intangible assets 250 251
Stock-based compensation expense 3,271 2,551
Deferred income taxes 1,407 400
Gain on sale of property and equipment (119) (770)
Other non-cash items 95 114
Changes in operating assets and liabilities    
Accounts receivable, net 13,062 (13,907)
Costs and estimated earnings in excess of billings on uncompleted contracts (20,859) 19,864
Receivable for insurance claims in excess of deductibles (484) (90)
Other assets 2,439 795
Accounts payable (11,162) (18,745)
Billings in excess of costs and estimated earnings on uncompleted contracts (4,484) 34,429
Accrued self insurance 308 (390)
Other liabilities 2,932 1,051
Net cash flows provided by operating activities 33,624 71,493
Cash flows from investing activities:    
Proceeds from sale of property and equipment 230 914
Purchases of property and equipment (35,992) (31,540)
Net cash flows used in investing activities (35,762) (30,626)
Cash flows from financing activities:    
Proceeds from exercise of stock options 450 1,717
Excess tax benefit from stock-based awards 390 971
Repurchase of common shares (10,585) (542)
Other financing activities 38 56
Net cash flows provided by (used in) financing activities (9,707) 2,202
Net increase (decrease) in cash and cash equivalents (11,845) 43,069
Cash and cash equivalents:    
Beginning of period 76,454 19,825
End of period $ 64,609 $ 62,894